Pull-socket cut-out arrangement



July 13 1926.

R. D.` SMITH PULL SOCKET cUT-oUT ARRANGEMENT Filed Nov. s. i920 above object,

Patented July 13, 1.926,

UNITED STATT-:s`

PATENT oFFlcE.

' RAYMOND D. SMITH, OF SCARSDALE, NEW YORK, ASSIGNOR, BY MESNE ASSIGNMENTS,

T0 TREMONT PRODUCTS CORPORATION,

PORATION 0F MASSACHUSETTS.

0F BOSTON, MASSA'JHUSETTS,` A COR- PULL-SOCKET CUT-OUT ARRANGEMENT.

i Application led N that incorporate automat invention relates to electric switches ic cut-out mechanism and has specific reference to pull-.0p-

erated switches for scribed by me in my Serial No. 421,556, A primary object is to provide in the now',

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standardized and roved form of double-break, socket-pullswitch mechanism referred to above, a novel arrangement of the usual swltch contact parts and of automatic mechanism co-operating fecting, automatically,

switch-governing therewith, for ef` a delayed circuitbreaking action of the switch a substantial interval of time after the pull chain has been actuated in the usual manner ing the light.

for extinguish- Specifically, my present invention contemplates, as a means for accomplishing the the introduction into said standardized form of switch mechanism .of

a novelly arranged thermo-motive -device that may be electrically energized l through a switch-controlled auxiliary circuit; an

further contemplates, for the 'action of said `motive co-operating with device, an advantageous re-arrangement of certain fixed 1nclined contact plates, characterizing the type of switch mechanism concerned. In the particular embodiments of the in-- vention illustrated herein,

the energization of the means for lgoverning thermo-motive device, a

of the usual, S-shaped, rotatable,

I employ, as a partial movement switching member from its normal circuitmaking position to a pos ition intermediate its usual positions'for respectively making and breaking the main clrcuit through the lamp. For this purpose I preferably introduce an auxiliary stationary contact positioned to be engaged by diverting current therefrom to the operat-A the thermo-motive device ing circuit 4for said member for when said member is moved to its said intermediate position.

venient to mount Specifically, I find it con-` such auxiliary contact on a common insulating support withone of the original, fixed, and inclined contact-plates that, as usual, is connecte cult,

d in the main circurrentovember 3, 1920. serial No. 421,555.-

I may, however, so arrange the 'various electrical connections that the operating circuit for the thermo-dynamic device shall kbe energized through such auxiliary contact by being connected in shunt to the lamp (or other switch governed load) or in series therewith. The embodiments herewith illustrated show the latter arrangement, which possesses the advantage that by adding the resistance of the the lamp to that of the electrical unit governing the thermo-motive device, there is eliminated' any necessity of employing an auxiliary rheostat for lowering the line voltage at the terminals of the said unit in cases where the latter (because of limitations of structure or of space) possesses, in itself, too little ohmic resistance to permit of its being subjected directly to the full line voltage when energized.

These and other advantageous features of the present improvement will be hereinafter described in detail and are clearly illustrated in the accompanying sheet of drawings wherein Fig. 1 is a view of` my improved pullsocket switch looking downwardly on the current switching parts, the pull-operated circuit-breaking action.

Fig. 4 is an enlarged fragmentary view looking in the direction of arrow 4 in Fig. 3, showing more clearly the relation of contact parts. I

Fig. 5 is a diagram of electrical connections.

' Fig. 6 is a fragmentary plan view showing a modification wherein a thermostatically driven pawl device is substituted for the restraining detent shown in Figs. 1 to 5 inclusive, the wiper being shown in advanced circuit-closingposition and arranged Jfor automatic circuit breaking actiont Fig. 7 shows the position of these modiiied parts in normal circuit making position,

the paWl, however, bein shown 1n al position Which it occupies W en the thermostat is heated.'

Fig. 8 is a fragmentary vievv' in front elevation showing the paWl device of Fig. 6; With the thermostat omitted;

Throughout the several views of the drawing identical parts are designated by -the same reference numeral.

the base 10, and terminating consecutively:

in abrupt insulating shoulders 21, Which prevent retrogressive rotation of the Wiper between steps.

An insulating actuator' segment 25, oper- 4 ated by the pull-chain 3 2, is pivoted to swing, on the stud 12, and to drive the Wiper arms 23 over the said steps inincrements of progressive rotation through engagement ot' registering teeth 33 and shoulders'34 on the actuator and Wiper respcctively,-the coiled spring 30, performing the double function of rotatively returning the actuator after each stroke on the pull-chain and of pressing the actuator axially against the Wiper 22, thus maintaining the latter in wiping engagement With the said incline steps. Brackets 35 and 43 form stops tolimit the swing of the actuator at each end of its stroke.

The incline step 17 carries a contact plate 37, electrically' connected to one leading-in Wire 60; diametrically opposite, incline steps l18, 20 are blank, and in my present improvement, the remaining step 19 carries two separate and insulated contact plates 38 and 39, electrically connected as Will later be described, the latter occupying the upper part and the former the lower part of the step incline surface this particular mechanical relation however being variable with respect to the requirements of diiferently designedv electrical relations for the main and auX- iliary circuits, hereinbefore mentioned as possible alternatives in practicing my invention. Contact plates 37 and 39, at diametrivali;v opposite points relative to the center ol' the switch, are each hunt at their terminal portion near thc fop ot the step shoulders 2l, lo forni au angle having an upwardly disposed apex. and a terminal 40 sloping downwardly from said apex. Wiper arms 23 when. rotatively advanced shown) over the apexes of the terminal portions of contact plates 37, 39, Will, Withoutv further manually caused movement, tend to slide simultaneously from off the two sloping contact plate terminals 40 leaving the same with a quick snap due to the axial action of spring 30, and thus producing automatically a quick and double break of the circuit through said Wiper and said contacts.

A detent lever 41, is pivoted on the stationary stud 42 mounted on the base 10 in a position to intercept oneof the two Wiper spurs 46, 46, When the ends of the Wiper arms are resting on the sloping plate terminals 40, as shown in Fig. 3, and is thus operative normally to check the tension-caused rotative advance of the Wiper before the arms 23 are discharged automaticallyv from the said terminals. The detent lever is thus operatively positioned by the curved bimetallic, iexing thermostat 49, which at its -free end 48 engages with the insulated detent lever projection 47 and at its opposite end is rigidly mounted on the insulated bracket which carries the bell-mouth guide 3l. The thermostatic lamina of greater expansibility is on thel inner side of the thermostat.

A .fine resistance Wire 50 is Wound on the thermostat and insulated therefrom. This wire, when electrically energized by the passing of current therethrough, acts to heat thel thermostat and cause a straightening flexi1re,therein, which flexure retracts the detent lever 41 from the path of spur 46 in the manner indicated in Fig. 3. One end 29 of the wire 50 is connected to the centersupported. contact 38, that transmits current to the center-terminal, contact-tongue 66 for the incandescent lamp 62; the other end 28, of the Wire 50, is attached tothe insulated contact 39 which is secured tothe base 10 by a screw 59. An outer casing 52 and metallic cap 51, interlocked by screws 77, are provided as usual, together with a bell-mouthguide 31 for the pull-chain 32.

The operation is as follows: In the circuitmaking position of parts shown in Fig. l,

-the current passes from the leading-in Wire through the binding-post bracket 35 to the vcontact plate 37, thence through the Wiper 22 to the contact plate 38, central screw 65, terminal tongue 66, filament (not of the incandescent lamp 62, threaded lamp receptacle53` screw 67, binding-'post bracket 36, to the other lead Wire 7 O.

A full stroke upon the pull-chain will advancel the actuator 25, and Wiper 22,:substantially 90, and the Wiper arms 23 into the position shown in Figs. 3, 4 and 5, in which position the wiper 1s arrested by the detent lever 41 as heretofore explained, the circuit paths here remaining as before eX- cept that current cannot now flowifrom the Wiper 22 directly to the contact 38, but

must go from said wiper through the contact 39 and the resistance wire 50 and thence to contact38, which path for the current establishes'the said resistance wire in series with the lampand so energizes the former to heat the thermostat.

When sufficiently heated the thermostat operates to retract the detent lever 41 as described, .thus releasing the wiper 22 after a short time interval and permitting axial tension in spring 3() automatically to effect circuit-breaking discharge of the wiper arms 23, 23 from the. contact'plates 37, 39.

Another stroke upon the' chain will again a advance the actuator and wiper approximately 90 and into a position similar to that shown in Fig. 1, thus lighting the lamp in the usual way, and independently of the thermostatic detent.

In this connection it should be noted that the diametrically opposite shoulders 21, of the blank steps 18 and 20, should be so spaced in the circle that the ends of wiper arms 23, will have passed said shoulders when the actuator 25 is stopped by insulated bracket 43. Since the the wiper 22 as driven by a full stroke of the actuator is substantially the same in both ycircuit-making and circuit-breaking action, and since it is required that at the end of such actuator stroke, the arms 23 shall clear steps 18 and 20 for circuit-making action, but shall not clear the plate-terminal 40 in circuit-breaking action, it follows that terminals 40 must each be spaced further from the preceding blank step shoulders respectively, than from the succeeding shoulders, or specifically (referring now to only one side ofthe switch) there must be more degrees of space between terminal 40 of plate 39, and shoulder 21 of step 18, .than

etween said terminal and the shoulder 21 of step 20. The only positional requirement of the shoulders of steps 17 and 19, however, is that they shall not extend in advance of the plate terminals 40. In the present disclosure, merely as an incident of illustration, the said shoulders are shown substantially in alignment with said terminals. The steps 17 and 19 obviously may possess any formation advantageous to the support of their respective contact plates.

An important feature of structural detail is that the separated contact plates 38 and 39.are placed notmerely end to end but are formed with registering notches and extensions to overlap each other in the same surface plane and in spaced relation thus insuring that one or both of said plates will at all times be contacted by the wiper arms when 'said arms traverse or occupy the steps that carry these two plates.

The arrangement is also preferably such that the actuator segment 25 is stopped'by the insulated bracket 43, or other. suitable degree of travel of means just after the ends of the wiper arms 23 have passed over the apexes of the angular contact plates 37 and 39 and before contact occurs between the spur 46 and the detent lever 41, the wi er being then advanced automatically to eflct such contact by the discharging action of spring 30.

A modified arrangement of automatic wiper-governing device is shown in Figs. 6 to 8 inclusive. Here the terminal portions of contact plates 37 and 39, as shown in Fig. 8, are formed to have no, or at least so little, downward slope that the axial tension exerted by spring 30 is not in itself` sufficient to cause the automatic circuit-break-N ing discharge of arms 23, 23y in the manner described in Figs. 1 to 5. In this modification therefore, the detent lever 41 is replaced by a trigger frame 71 composed of two arms 72 fast to a common hub 73 pivoted to swing on the stud 42. These arms carry a vertical pivot pin 74 on which is pivoted a trigger finger 75, normally positioned relative to the trigger frame 71 as shown in full lines in Figs. 6 and 7 by the spring 76, and permitted 'to-yield to the broken-line position indicated in Fig. 6`

against 'the tension in said spring. In the operation of this arrangement, the bracket 43 stops the actuator 25 as usual when the end of the wiper arms are positioned as in Fig. 6. As before stated, these arms are not in this modification capable of automatic circuit-'breaking discharge by the spring 30, when in this position, but when said position is reached spur 46 has advanced to its position shown in Fig. 6 in advance of the trigger finger 7 5 the latter yielding to permit the passing of the formen-and in the manner before described the thermostat is then heated to cause its outbending which swings the trigger frame 71 clockwise in Fig. 6 about the stud 42, and by engagement ofthe finger 75 with spur 46 drives the wiper rotatively until the ends of arms 23 clear the contact plate terminals 40 whereupon the spring 30 acts to break the circuitin the usual manner. It should be noted that here the lspring 30 is relieved of what, in the forms shown in Figs. 1 to 5, inclusive, is, in effect, the imposition thereupon of an additional function, namely, that of causing rotative advance of the wiper 22 (by the exertion of axial pressure thereon) in a direction that is opposite to the rotative direction in which.said spring exerts its torsional force for returning the actuator 25 to the beginning of its stroke.

Preferably, in the modified arrangement just described, a second spur 45 is formed onneach of the arms 23 and to engage witha square shoulder 63 on the hub the trigger finger for preventing rotativemovement of the wiper to its position as shown in Fig. 6 unless the thermostat is so positioned as.

isb

` be the case were the thermostat not permitted to become normally cool before subsequent advance of the wiper to its position as shown in Fig. 6, If the lamp, after being extinguished, is immediately turned on again, the thermostat must. have time to cool before the lamp can be again extinguished, since the linger and the spur 63 assume the position indicated in Fig. 7 so long as the thermostat remains hot. f`

As before stated, the circuit connections herein described are merely illustrative of an electrical arrangement which enables the thermostatic detent to be governed b the switch controlled current through the simple and etlicient structural arrangement'of main` and auxiliary contact plates as herein described. It will be understood however that such arrangement is adaptable and advantageous to many other circuit arrangements, such` for instance as that employed in the switch described in my other application hereinbefore referred to wherein the thermostat winding is energized by being connected in shunt to the lamp, or directly across the supply line.

Relativeto the particular structural type of lamp socket that I have herein chosen as illustrating a useful application of my present improvement in switch mechanism (namely the fixture type of socket adapted for electrical connection with leading-in current-supply wires by means of binding-post screws) it should be noted that although the aggregate socket and switch structure is so compactly arranged that substantially no increase in size of such a structure is'necessitated, yet the binding-post screws for the leading-in wires are sufliciently spaced and otherwise removed from interference by any of the new parts, that the additionof such new parts has introduced no disadvantageous features of fragility or complexity to require unusual care or attention on the part of the unskilled workman in assembling and installing my improved pull socket. It will further be observed that the binding-post screws (which are important elements in fixture sockets) as employed in a pull sock-et embodying my invention, are of the same size and in the same location as customarily constructed in non-automatic socket switches.

My improved switch mechanism, however, may readily be incorporated in any of the various other structural types of pull sockets` such, for instance, as the adapter form, that is designed as a temporary attachment to be interchangeably interposed between any standard electric socket and its usual incandescent lamp.

The feature illustrated in Figs. l to 5 inclusive, wherein the abrupt incline of contac-t terminal 40 tends to discharge contact arms 23 into a circuit breaking position except when restrained by detent 41, is not claimed in this application, .but is the subject matter of claims in my co-pending application, Serial No. 421,556, filed November a, 1920.

Having thus described a preferred and specific embodiment of my improved switch mechanism, I make the following claims as descriptive of my invention, but without intention to limit the scope of such invention to the precis-e form and arrangement of details herein disclosed.

l. Controlling mechanism designed to be operated by successive manual actuations, and having means automatically to delay for a limited interval of time the operative response of said apparatus to one of the said manual actuations, said means embodying, in combination; a rotatively driven ratchet member; a pawl-carrying actuator therefor mounted to oscillate and arranged by successive manually-caused forward strokes to impel said member intermittently and positively in the same direction; ratchet seats arranged consecutively in the path of said member for normally positioning the same; means to cause a stroke of said actuator `for normally positioning said member on one of said ratchet seats, and further arranged to limit the subsequent stroke of said actuator before said member has been impelled thereby to its normal position on the next succeeding ratchet seat; and a slow-acting motive device operatively related to said member as manually caused by the said stoplimited, subsequent actuator stroke, therebyl automaticall to impel said member to its normal posltion on the said succeeding ratchet seat after a substantial interval of time.

2. In an electric switch having a one-way rotatable current-switching member, an oscillatory actuator therefor arranged by successivestrokes in the same direction to advance said ymember progressively step-bystep to make and break a` main circuit, and means to cause a stroke of said actuator for establishing said member in a normal circuitmaking position, in combination; a circuitconnected fixed contact mounted and co-operativcly positioned relative to said member to remain conductively engaged by said member, after advance of the latter from its said normal circuit-making position as caused by a stroke of said actuator subsequent to the circuit-nlaking stroke thereof whereby said circuit is retained temporarily closed; and a slow-acting motive device operatively related to said member and connected to be rendered active by the said subsequent actuator stroke thereby automaticalcessive strokes 4in the same direction to advance said member progressively step-bystep to make and break a main circuit, and means to cause a' stroke of said actuator-for 'establishing said member in a normal circuitmaking position, in combination;a circuitconnected fixed contact mounted and co-'operatively positioned relativeto said member to remain conductively engaged by said member, after advance of the latter from its said normal circuit-making position as caused by a stroke of said actuator subsequent to the circuit making stroke thereof, whereby' the said circuit is retained temporarily closed; and a slow-acting motive device operatively related to said member and connected to be rendered active through the said further ad- Vance of said member, thereby automatically to impel said member to a furthe-r advanced to break the said circuit.

osition 4. In a pull socket having pawl-and-ratchet lswitch-operating mechanism, including a current-switching member mounted `for stepcurrent-switching member mounted for step-` by-step rotative advance to control a circuit, anda pull-operated spring-returned actuator arranged by one stroke thereof to advance said member to a normal circuit-making poe sition and by a subsequent stroke thereof to advance said member further and toward a normal circuit-breaking position thereof, in combination; means normally operative to arrest the said subsequent actuator stroke before said'member reaches said normal circuit-breaking position; and a slow-acting motive device connected to be set in operation by said subsequent oscillator stroke,and arranged thereupon automatically to impel said member to its said circuit-breaking position, after a substantial interval of time.

5."In a pull socket having pawl-and-ratchet switch operating mechanism, including a Icy-step rotative advance to control a-circuit, and a pull-operated spring-returned oscillator arranged by one stroke thereof to advance said member to a normal circuit-making position and by a subsequent stroke y thereof to advance said member further and' toward a normal circuit-breaking position thereof, in combination; means normally operative to arrest the said subsequent actuator stroke before said member reaches its said normal circuit-'breaking position and a thermodynamic device operatively related to said subsequent oscillator stroke, thereby to be rendered slowly activeto impel said member to its said circuit-breaking position, after a substantial interval of the time.

6..In an electric switch with circuit con- -quick discharge o f 'said member nections for a switch-governed load and having a rotatable pivoted contact-wiping member tensioned for sliding engagement with a fixed leaf circuit-contact mounted to cause a quick snap-break movement of said member transverse the said contact when the former passes the latter, to cut out the load, in combination; electro-thermally actuated instrumentalities having a governing circuit and arrangedautomatically to impel said member past said leaf contact; the said contact being electrically connected to govern an operating circuit for said instrumentalities, and positioned to be engaged by said member for energizing said circuit when the member is substantially advanced relative lto its normal load-energizing position; together with connections to retain the switch overned load in circuit during'the period o` energization of said instrumentalities.

7. In a. pull socket switch embodying a. rotative, load-controlling current-transmitting member arranged to be driven intermittently in the said direction through limited intervals of. circuit-controlling travel and in wiping engagement with spaced, in-

clined contact plates, said member beingv tensioned against said plates,l whereby from the respective terminals of ,consecutive plates 1s vcaused upon rotation of the former past the latter, -in l combination; auxiliary currentswitching means arranged to be operated by movement of said member through only a part of one of its said increments of travel; and' an automatic motive device electrically controlled by said current-switching means, and adapted when rendered operative to impel said member automatically to the end of its said increment of travelfor quick circuit-breaking discharge from one of the said contact plate terminals.

8. A pull socket switch having a movable contact member mounted as a pawl-driven ratchet wheel, and (1o-operatingA inclined fixed 4contact leaves mounted in the path `of said member and on insulating supports,

arranged to co-act with said member as stationary click-steps for-normally positioning the same in which one ofsaid insulating supports carries a plurality of separate contact leaves connected respectively in different switch-controlled circuits, whereby movement of said member between its normal successive positions,as determined by the said insulating. supports, operates sequentially to control the energization of said different circuits. A

9. A pull socket switch having a movable contact membermounted as a pawl-driven ratchet wheel and co-operating inclined stationary contact leaves mounted in the path of said member and on insulating supports, arranged to co-act with said member as stationary click-steps for normally positioning the same; in which one of said insulating Supports carries a main circuit-connected contact leaf and an auxiliary circuit contact leaf insulated therefrom, said main and auxiliary contact leaves being co-operatively positioned so that said member engages operatively With only one of said leaves in a designed rotative position relative to said support but engagesv operatively with the other of said leaves upon substantial advance movement of said member from its last mentioned position.

10. A pull-socket switch embodying in combination, contact insulating and supporting tables; ay stationary main circuit Contact plate carried 011 one of said tables; two separate contact plates carried on another of said tables and positioned thereon in spaced relation, one of said separate plates being connected in the main circuit;

a current-switching rotor pivoted to Wipev over said plates in its travel, said separate plates being positioned respectively to be electrically connected to said first plate in variable relation in ditlerent positions of said rotor; an electro-thermal motive device having electrical connection to the 'other of said separate plates whereby said device is energized only in a designed position of said rotor; and automatic instrumentalities governed by said electrical device and arranged to cause delayed niain-circuit-breaking movement of said rotor when said" device is energized.

1l. In an electric switch, a movable current switching member, means to advance said member toward a normal circuit breaking position, with means to arrest the same before saidy member reaches said normal Circuit breaking position, and a slow acting motor device connected `to be set in operation simultaneously with said movement and arranged automatically to impel said member toits circuit breaking position after a substantial interval of time.

12. An electric socket switch having a lamp circuit, a contact controlling member, means manually to mo`ve the latter, a device to complete the movement of said member, said member being placed in operative relation to said device by the manual movement thereof, and electrically responsive means to move said device and cause extinguishment of the lamp after a substantial period of time following the manual movement of said member.

13. An incandescent lamp switch having a delayed action control for retarding the lamp extinguishing action, and including an impelling device to complete the lamp extinguishment, and a thermo-'electrically controlled member to move said impelling device.v

14;. lA lamp switch having a movable control member, a delayed action `control for retarding lamp extinguishment, including a thermo-electric device, and a. normally inactive impeller for the control member rendered active by said thermo-electric device.

15. An electric switch having a movable contact controlling member, means to initiate a circuit breaking movement thereof, a normally inactive im elling device to complete the movement ol said member, and a thermo-electrically controlled device to render said impelling device active after the lapse of a substantial period of time following the initiation of said circuit breaking movement.

16. An electric switch having a manually actuated contact controlling member with 4means for initiating a circuit breaking movement thereof, a normally inactive impelling device operatively related to said contact controlling member, and electrically responsive means to render said member active to exert a. moving force against the contact controlling member to complete the circuit breaking movement only after the lapse of a substantial interval of time.

17. A11 electric switch having means to initiate a circuit changing movement, and a normally inactive impelling device with means for rendering the same active after the lapse of a substantial time automatically to complete the circuit changing movement.

18. An electric switch having a contact member, means to initiate a circuit changing movement of said member, and a delayed action motive device automatically to impel said member thereby to complete its circuit changing movement after the lapse of al substantial time. I

19. A pull socket switch having a rotary contact member, an oscillatory actuator, one or more stationary inclined contact leaves mounted in the path of said member, insulating supports for the `latter arranged to co-act with said member as stationary click steps for normally positioning the same, means to delay lamp extinguishment for a substantial period of time following a lamp extinguishing movement of the actuator, and an auxiliary control.contact for said delay means also arranged on one of said insulating supports to be engaged by said rotary contact member.

20. A pull socket switch having a rotary contact rmember, an oscillatory actuator, one or more stationary inclined contact leaves mounted in the path of said member, insulating supports for the latter arranged to co-act with said member as stationary click. steps for normally positioning the same, means to delay lamp extinguishment for a substantial period of time following a lamp extinguishing movement of the actuator, and an auxiliary control contact for said delay means upon one of said insulatmain and auxiliary contacts to engage said ing supports and positioned adjacent to but insulated from one of said main contacts, said auxiliary and main contacts being positioned to be simultaneously engaged by said contact member in one position of the latter and said main contact to'be engaged alone in another position of said member.

21. A pull socket switch having -a rotary contact member, an oscillatory actuator, one or more stationary inclined contact leaves mounted in the path of said member, insulating supports for the latter arranged to co-act with said member as stationary click steps for normally positioning the same, means to delay lamp extinguishment for al substantial period of vtime following a lamp extinguishinffr movement and an auxiliary control contact for said delay means upon one ofy said insulating supports and positioned adjacent to but insulated from one of said main contacts, said rotary contact member being related to said main contact alone in one position, both of said contacts' in a succeeding position and said auxiliary contact' alone in a further position. i

22. A pull socket switch having a rotary contact member, an oscillatory actuator, one or more stationary and main contact leaves lmounted in the path of said member, means to delay the lamp extinguishing movement for a substantial period lof time following the lamp extinguishing movement ofthe actuator, and an'auxihary leaf contact` for controlling said delay means insulated from but in juxtaposition to one of said main contacts, whereby both of said main and auxiliary contacts are engaged by the contact member in one position of the latter.

23. Inan electric lamp switch, the combination with a one-way rotary contact controlling member, an oscillatory actuator, one or more stationary main contacts mounted in the path of said member, the latter being adapted to be moved by said actuator to disengage from said main contact or contacts and extinguish the lamp,

\ member.

means to delay the lamp extinguishing movement of said member for a substantial interval after the lamp extinguishing movement of said actuator, said means including av control device engaging said contact controlling member, andl an auxiliary control.

contact for said delay means adapted also to be engaged by said rotary contact 24. In an electric lamp switch, the combination with a one-way rotary contact controlling member, of an oscillatory actuator, one or more stationary main contacts mounted in the path of said member, said member being adapted to be moved by said actuator to disengage from said main conof the actuator,

movement of said actuator, and an auxiliary wiper contact for controlling said delay means also within .thepath of said rotary contact member and engaged by the-latter when said actuator is moved to extinguish the lamp.

25. In an electric switch, the combination with a movable contactcontrolling member, an actuator, one or more stationary contacts mounted in the path of said member, the latter being adapted to be moved to disengage from said main contact or contacts and extinguish the lamp, means to delay the lamp extinguishing movement of said member for a substantial interval, and an auxiliary wiper contact for controlling said delay means within the path of said contact controlling member.

26. In an electric lamp switch,the combination with a movable contact controlling member, a main contact mounted in the path of said member, said member being adapted to be moved to engage with and disengage from said main contact in lighting and extinguishing the lamp, means to stop the lamp extinguishing movement of said member and allow the completion of the same only after a substantial intervalv of time has elapsed, and an auxiliary wiper contact for controlling said stop means within the path of said rotary contact member and adapted to be engaged in one position of the lattter simultaneously with said main contac i 27. In an electric lamp switch, the combination with a movable contact controlling member, a main contact mountedin the path of said member, said member being adapted to be moved to engage with and disengagefrom said main contact in lighting and extinguishing the damp, means to stop the lamp vextinguishing movement of said member and allow the completion of the same only after a substantial interval of time has elapsed, andY an auxiliary contact for -controlling said stop means also within the path of said movable contact controlling member, the latter being adapted to engage the main contact alone to light the lamp and in a succeeding position to vengage both main and auxiliary contacts, and in its aforesaid stop position to engage the auxiliary contact alone. l.

28. In a pull actuated switch, in combination, inclined contact supporting steps, a contact rotor pressed into engagement with said steps, and two contacts mounted in spaced and insulated relation on a common one of said steps, thereby to be traversed by said rotor in its sliding movement over said f step to energize in predetermined sequence tWo circuits terminating respectively at each of said contacts.l

29. An electric light switch embodying in combination, with a. slow acting motive device furnishing power to slowly move the switch contacts, an actuatorfor positioning the Said switch contacts to close the light circuit and connections whereby subsequent movement of said actuator sets in operation 10 said motive means.

Signed at Boston, in the county of Suffolk and Commonwealth of Massachusetts, this 25th day of October, 1920.

RAYMOND D. SMITH. 

